Update dependency postcss to v8.4.25

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.21 -> 8.4.25

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Release Notes

postcss/postcss (postcss)

v8.4.25

Compare Source

• Improve stringify performance (by Romain Menke).
• Fixed docs (by @​vikaskaliramna07).

v8.4.24

Compare Source

• Fixed Plugin types.

v8.4.23

Compare Source

• Fixed warnings in TypeDoc.

v8.4.22

Compare Source

• Fixed TypeScript support with node16 (by Remco Haszing).

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